1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
|
/*
* This file and its contents are supplied under the terms of the
* Common Development and Distribution License ("CDDL"), version 1.0.
* You may only use this file in accordance with the terms of version
* 1.0 of the CDDL.
*
* A full copy of the text of the CDDL should have accompanied this
* source. A copy of the CDDL is also available via the Internet at
* http://www.illumos.org/license/CDDL.
*/
/*
* Copyright (c) 2012 by Delphix. All rights reserved.
*/
/*
* Make a directory busy. If the argument is an existing file or directory,
* simply open it directly and pause. If not, verify that the parent directory
* exists, and create a new file in that directory.
*/
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <dirent.h>
#include <strings.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
static void
usage(char *progname)
{
(void) fprintf(stderr, "Usage: %s <dirname|filename>\n", progname);
exit(1);
}
static void
fail(char *err, int rval)
{
perror(err);
exit(rval);
}
static void
daemonize(void)
{
pid_t pid;
if ((pid = fork()) < 0) {
fail("fork", 1);
} else if (pid != 0) {
(void) fprintf(stdout, "%ld\n", (long)pid);
exit(0);
}
(void) setsid();
(void) close(0);
(void) close(1);
(void) close(2);
}
int
main(int argc, char *argv[])
{
int ret, c;
boolean_t isdir = B_FALSE;
boolean_t fflag = B_FALSE;
boolean_t rflag = B_FALSE;
struct stat sbuf;
char *fpath = NULL;
char *prog = argv[0];
while ((c = getopt(argc, argv, "fr")) != -1) {
switch (c) {
/* Open the file or directory read only */
case 'r':
rflag = B_TRUE;
break;
/* Run in the foreground */
case 'f':
fflag = B_TRUE;
break;
default:
usage(prog);
}
}
argc -= optind;
argv += optind;
if (argc != 1)
usage(prog);
if ((ret = stat(argv[0], &sbuf)) != 0) {
char *arg, *dname, *fname;
int arglen;
char *slash;
int rc;
/*
* The argument supplied doesn't exist. Copy the path, and
* remove the trailing slash if present.
*/
if ((arg = strdup(argv[0])) == NULL)
fail("strdup", 1);
arglen = strlen(arg);
if (arg[arglen - 1] == '/')
arg[arglen - 1] = '\0';
/*
* Get the directory and file names, using the current directory
* if the provided path doesn't specify a directory at all.
*/
if ((slash = strrchr(arg, '/')) == NULL) {
dname = strdup(".");
fname = strdup(arg);
} else {
*slash = '\0';
dname = strdup(arg);
fname = strdup(slash + 1);
}
free(arg);
if (dname == NULL || fname == NULL)
fail("strdup", 1);
/* The directory portion of the path must exist */
if ((ret = stat(dname, &sbuf)) != 0 || !(sbuf.st_mode &
S_IFDIR))
usage(prog);
rc = asprintf(&fpath, "%s/%s", dname, fname);
free(dname);
free(fname);
if (rc == -1 || fpath == NULL)
fail("asprintf", 1);
} else if ((sbuf.st_mode & S_IFMT) == S_IFREG ||
(sbuf.st_mode & S_IFMT) == S_IFLNK ||
(sbuf.st_mode & S_IFMT) == S_IFCHR ||
(sbuf.st_mode & S_IFMT) == S_IFBLK) {
fpath = strdup(argv[0]);
} else if ((sbuf.st_mode & S_IFMT) == S_IFDIR) {
fpath = strdup(argv[0]);
isdir = B_TRUE;
} else {
usage(prog);
}
if (fpath == NULL)
fail("strdup", 1);
if (isdir == B_FALSE) {
int fd, flags;
mode_t mode = S_IRUSR | S_IWUSR;
flags = rflag == B_FALSE ? O_CREAT | O_RDWR : O_RDONLY;
if ((fd = open(fpath, flags, mode)) < 0)
fail("open", 1);
} else {
DIR *dp;
if ((dp = opendir(fpath)) == NULL)
fail("opendir", 1);
}
free(fpath);
if (fflag == B_FALSE)
daemonize();
(void) pause();
/* NOTREACHED */
return (0);
}
|
